🏔️ Rain Shadow Transect Lab: Parcel Thermodynamics, Rain-Gauge Line and Lee-Side Warming

Carry an air parcel over a ridge: it cools dry-adiabatically to its lifting condensation level, rains out on the windward slope along a rain-gauge transect, and sinks on the lee side warmer and drier than it started. Change humidity, ridge height and width, wind and precipitation efficiency; checks use the equivalent potential temperature invariant, the no-rain reversible limit and the latent-heat budget.